x除8=y+30

x 除 8 = y + 30

The answer is :

x = 320

y = 10

320 ÷ 8 = 10 + 30

so 40 = 40

呢條式可以用 graph 畫條直線黎答

x/8=y+30
x=8(y+30)
x=8y+240

if x=0, y=-30
if y=0, x=240

用呢兩點有 graph 上畫一條直線, 有直線上的所有數值都可以符合呢條算式, 都係答案.

x=248, y=1
x=256, y=2
x=262, y=3......
x=240, y=0
x=232, y= -1
x=224, y= -2
x=216, y= -3......
x=1, y= -29.875
x=2, y= -29.75
x=3, y= -29.625......
∴∞solutions for x/8 = y+30 (這是 x除以8=y+30)

若 x除8=y+30, (8/x=y+30)
x=1, y= -22
x=2, y= -26
x=3, y= -27 1/3 (負廿七又三份之一) or -27.3333 (to 4 d.p.)
x=4, y= -28......
∴∞solutions for 8/x = y+30

x=320 , y=10